Add the explicitly mutable flag for creating a PendingIntent in MediaOutputSlice

Bug: 175124820
Test: make -j50 RunSettingsRoboTests
Merged-In: Ic37b37bdbe6de6bdbad741985d3a920334240d80
Change-Id: I49bc2f1fe903422e08ef3b98993f1b60df458d9c
1 file changed